Most of the men who governed China across its long history were Chinese. The Yuan dynasty was the first time the whole of China proper fell under the rule of a non-Han people — and not just any foreigners, but the Mongols, the steppe horsemen whose grandfathers had built the largest contiguous land empire the world has ever seen by killing on a scale that depopulated whole regions. The man who pulled it off was Kublai Khan, grandson of Genghis. And the interesting thing about Kublai is that he understood something most conquerors never grasp: you cannot rule a sophisticated agricultural civilization the way you rule a nomadic confederation. The tools are different. The legitimacy is different. The whole logic of the thing is different. So Kublai did something genuinely novel. He kept being the Great Khan of the Mongols — the nominal overlord of the Golden Horde, the Chagatai Khanate, and the Ilkhanate spread across Asia — while simultaneously reinventing himself as a Chinese Son of Heaven, founding a dynasty in the classical style, claiming the Mandate of Heaven, and governing through a Chinese-style bureaucracy. He wore two crowns. He spoke to his Mongol subjects as one of them and to his Chinese subjects as their rightful emperor, and he spent his whole reign managing the tension between those two roles. It worked for him. It worked considerably less well for his successors. And after ninety-seven years, the whole arrangement collapsed and the Mongols rode back to the steppe they had come from.
The Yuan dynasty (1271-1368) was the Mongol-led imperial dynasty that ruled all of China. Kublai Khan founded it by combining Mongol military power with Chinese imperial tradition — governing the wealthiest civilization on earth as a foreign conqueror.
From Genghis to Kublai: How a Mongol Ended Up Wanting to Be Chinese
Genghis Khan united the Mongol tribes in 1206 and spent the rest of his life conquering. His sons and grandsons continued the work. By the time Kublai was a grown man, the Mongol Empire stretched from Korea to the edges of Europe. Kublai was different from his warrior relatives in one important way: he had been raised partly inside Chinese intellectual traditions. His mother, Sorghaghtani Beki — one of the more remarkable political figures of the 13th century, a woman who positioned all four of her sons to become rulers — had attached Han Chinese tutors to him from early childhood. He could not read Chinese himself, and never fully learned to. But he understood Chinese statecraft. He surrounded himself with Confucian and Buddhist advisers. He grasped that the wealth and population of China dwarfed anything the steppe could produce, and that whoever controlled China properly would be the most powerful man in the Mongol world. When his brother Möngke became Great Khan in 1251, Kublai was given control over Mongol-held territories in northern China. He used the opportunity to start governing in the Chinese manner. He built schools for Confucian scholars. He issued paper money. He revived Chinese rituals and supported policies that grew agriculture and trade. He built a capital city, Shangdu, in Inner Mongolia — the Xanadu of Coleridge's poem, centuries later. Möngke died in 1259 while campaigning against the Southern Song. There was no designated successor. Kublai's younger brother Ariq Böke — who represented the traditionalist Mongol faction that wanted the empire's center to stay on the steppe — claimed the throne. Kublai claimed it too. The result was a four-year civil war between two brothers, fought over the fundamental question of what the Mongol Empire was going to become: a steppe confederation or a Chinese-style empire. Kublai won, partly because he controlled the agricultural wealth of northern China and could keep his army supplied while Ariq Böke ran short. Ariq Böke surrendered in 1264. But the war had consequences that outlasted it: the three western khanates had effectively gone their own ways during the conflict, and the unified Mongol Empire was finished as a single political entity. Kublai was Great Khan in name, but in reality he ruled China and Mongolia, and the western khans ran their own affairs.
1271: Declaring a Chinese Dynasty
In 1271, Kublai took a step his grandfather would not have recognized. He proclaimed a Chinese-style dynasty with a Chinese dynastic name: Great Yuan. The name came from the I Ching, the ancient Chinese Book of Changes, from a phrase meaning something like the primal force or the origin of the universe. It was a deliberate, sophisticated choice — a Mongol khan reaching into the deepest stratum of Chinese classical tradition to legitimize his rule. He placed Genghis Khan on the official imperial records as the dynasty's founder, giving his grandfather the Chinese temple name Taizu. He claimed the succession of all the legitimate Chinese dynasties going back to the mythical Three Sovereigns and Five Emperors. He moved his capital to a new city he built near modern Beijing and called it Khanbaliq — the Khan's City — known in Chinese as Dadu, the Great Capital. The message was clear. The Yuan was not a foreign occupation in Kublai's official telling. It was the latest in the long line of legitimate Chinese dynasties, holding the Mandate of Heaven, just with Mongol rulers. Whether anyone believed this was another question. Many Han Chinese never accepted the Yuan as legitimate at all, regarding it as a period of foreign domination rather than a proper dynasty. But Kublai had laid the ideological groundwork for ruling China as China expected to be ruled. There was still one obstacle. The Southern Song dynasty controlled the wealthy, populous heart of China south of the Yangtze, and it had not surrendered.
The Conquest of the Song
The Southern Song was not an easy target. It was the richest and most technologically advanced society in the world at the time — a civilization of huge cities, sophisticated industry, gunpowder weapons, a powerful navy, and a population in the tens of millions. The Mongols had been chipping at it for decades. The key was the siege of Xiangyang, a fortress city controlling access to the Yangtze River basin. The Mongols besieged it from 1268 to 1273 — five years — and only took it after bringing in Muslim engineers from the Ilkhanate who built counterweight trebuchets powerful enough to break the walls. The fall of Xiangyang opened the road south. In 1276 the Mongols took Hangzhou, the Song capital and the wealthiest city in China. The child emperor Gong of Song surrendered and was, in a characteristically Mongol gesture, married off to a princess of the Borjigin imperial family rather than killed. Song loyalists fled south with a younger boy whom they enthroned as a last emperor, and the final act played out at sea. In 1279, at the Battle of Yamen near modern Macau, a Yuan fleet commanded by the Han Chinese general Zhang Hongfan destroyed the last Song loyalist forces. As the battle was lost, a Song official took the seven-year-old last emperor in his arms and jumped off a cliff into the sea. Both drowned. Hundreds of loyalists followed them into the water rather than surrender. The Song dynasty was over. For the first time in over three hundred years, northern and southern China were united under a single ruler. That the ruler was a Mongol was, from the perspective of the dynasty's official ideology, a detail. From the perspective of many of the conquered, it was the whole point. It is worth pausing on one detail of the conquest: a great deal of the actual fighting against the Song was done by Han Chinese. The Yuan armies that broke the Song included a Han Army made of defected Jin troops and a Newly Submitted Army of defected Song troops. The decisive admiral at Yamen was Chinese. The Mongol conquest of China was substantially carried out by Chinese soldiers fighting for Mongol khans, which complicates any simple story of foreign invasion.
At the Battle of Yamen in 1279, Yuan naval forces under the Han Chinese general Zhang Hongfan crushed the last Song resistance. The seven-year-old last Song emperor drowned when a loyal official leapt into the sea holding him, ending three centuries of Song rule.
The Failed Invasions of Japan
Kublai was not content with China. Like his grandfather, he believed Mongol power should keep expanding, and he launched a series of overseas and tropical campaigns that mostly ended badly. The two invasions of Japan are the famous failures. In 1274, a Yuan fleet attacked Japan and was driven off, partly by Japanese resistance and partly by a storm. In 1281, Kublai tried again with a much larger force — one of the largest seaborne invasions in history before the 20th century, with perhaps 140,000 men in two fleets. The Japanese had built defensive walls and fought the invaders to a standstill on the beaches of Kyushu. Then the weather intervened. A massive typhoon struck the Yuan fleet at anchor and destroyed most of it. Tens of thousands of soldiers drowned or were stranded and killed. The Japanese called the storm kamikaze — the divine wind — and read it as proof that the gods protected Japan. The word would acquire a very different meaning seven centuries later. The Japanese invasions were not Kublai's only overseas failures. His campaigns against Annam (northern Vietnam), Champa (southern Vietnam), Java, and Burma all ran into the same problems: tropical disease, unfamiliar terrain unsuited to Mongol cavalry, long supply lines, and determined local resistance. The Trần dynasty of Vietnam defeated the Mongols decisively at the Battle of Bạch Đằng in 1288, using wooden stakes hidden under the water at high tide to impale the Yuan fleet as the tide went out — a tactic that had been used against Chinese invaders centuries before and worked just as well against Mongols. Most of these states ended up acknowledging nominal Yuan suzerainty and paying tribute, which let Kublai claim a kind of victory. But the reality was that Mongol military power, so devastating on the open plains of Asia, hit a hard ceiling in the jungles and oceans of the south. The horse archers who had conquered half the world could not conquer a rice paddy.
Pax Mongolica: The World Kublai Opened
Whatever its military limits, the Yuan presided over something genuinely transformative: the Pax Mongolica, the Mongol Peace. For the first time, a single political order — or a set of allied Mongol orders — stretched across the whole of Asia, and goods, people, and ideas could move along the Silk Road with a safety they had not enjoyed in centuries. Kublai actively cultivated this. He protected the Mongol postal relay system, built infrastructure, provided loans to finance trade caravans, and pushed paper money to grease commerce. He expanded the Grand Canal so that grain and goods could move from the rich south to the capital in the north. The result was a flowering of trade and cultural exchange between East and West that fed directly into the later European age of exploration. The most famous beneficiary was Marco Polo. The Venetian merchant arrived at Kublai's court and, by his own account, spent seventeen years in the Khan's service traveling throughout the empire. The book he dictated afterward — Il Milione, the Travels — was the most influential European account of China for centuries, and it shaped European ideas about the wealth of the East so powerfully that Christopher Columbus carried a heavily annotated copy on his voyage across the Atlantic two hundred years later, looking for the China that Marco Polo had described. The exchange ran in every direction. Muslim astronomers, doctors, and mathematicians came east and introduced Middle Eastern science to China. The astronomer Guo Shoujing reformed the Chinese calendar to a precision of 365.2425 days per year — only twenty-six seconds off the modern value, and achieved three centuries before the Gregorian calendar reached the same accuracy in Europe. Persian cartography and medicine entered China. New crops arrived — carrots, certain melons and eggplants, new varieties of lemon, high-quality granulated sugar, and cotton, which would transform Chinese textile production. Chinese innovations flowed west in return. Printing techniques, porcelain, playing cards, gunpowder formulas, and medical knowledge moved toward the Middle East and Europe. The blue-and-white porcelain that the world now thinks of as quintessentially Chinese was actually a Yuan-era innovation, developed at the Jingdezhen kilns in the early 1300s and exported heavily to the Islamic world, where the cobalt blue pigment originally came from. It is a perfect symbol of the period: a Chinese product made with Persian materials for an Islamic market under Mongol rule.
Blue-and-white porcelain — now seen as quintessentially Chinese — was a Yuan-era innovation, made with Chinese craftsmanship and Persian cobalt for Islamic markets. It captures the cosmopolitan, trade-driven character of the Mongol Peace.
The Four-Class System and the Problem of Ruling China
The central difficulty of Yuan rule was demographic. A relatively small number of Mongols were trying to govern an enormous Han Chinese population that vastly outnumbered them and possessed a more sophisticated administrative tradition. How do you keep control under those conditions? The Yuan answer was a hierarchy that sorted the population into four broad categories. At the top were the Mongols. Below them were the Semu — the various Central Asian and Western peoples who served the regime as administrators and specialists: Central Asian Muslims, Uyghurs, Tibetans, Nestorian Christians, even some Europeans. Third came the Han — confusingly, this meant the northern Chinese and others who had been subjects of the earlier Jin dynasty, including some Khitans, Jurchens, and Koreans. At the bottom were the Nan, the Southerners — the people of the former Southern Song, who had held out longest against Mongol conquest and were trusted least. The logic of the ranking, importantly, was not strictly racial. It was about when you had submitted to the Mongols. The earlier you surrendered, the higher you ranked; the longer you resisted, the lower. This is why the northern Chinese outranked the southern Chinese — the north had fallen to the Mongols decades before the south. The Uyghurs, who had submitted very early and barely fought at all, ranked above the Koreans, who submitted later. How much this system mattered in daily life is genuinely debated by historians. Some scholars, including Frederick Mote, have argued that the four classes described legal and institutional privileges rather than actual social power — there were rich, high-status Chinese and poor, mistreated Mongols throughout the dynasty. Some Japanese historians have questioned whether the Semu really functioned as a coherent class at all. The system was real as a framework of legal privilege, but it was not a rigid caste structure that determined everyone's life. What is clear is that the Yuan deliberately kept the Han Chinese elite away from the highest levels of power for most of the dynasty. The Confucian examination system — the traditional path by which educated Chinese entered government — was suspended for decades and only restored, in limited form, in 1313. Even then, very few Chinese reached the top posts, which the Mongols and Semu kept for themselves. The Yongle Emperor of the later Ming dynasty pointed directly at this discrimination as a cause of the Yuan's downfall: the Mongols, he said, employed only Mongols and Tartars and discarded the Chinese, and this was precisely what brought disaster upon them.
Religion, Culture, and a Strangely Tolerant Empire
For all its discrimination in matters of political power, the Yuan was strikingly tolerant in religion. Buddhism, Islam, Christianity, Manichaeism, Taoism, and Confucianism all coexisted under Mongol rule. Kublai personally favored Tibetan Buddhism — specifically the Sakya sect, whose leaders he kept at court as Imperial Preceptors with considerable power — which became something close to a state religion. But he did not impose it on everyone. The Mongol period dramatically increased the Muslim population of China, as Central Asian Muslims came east to serve as administrators and merchants. The number of Chinese Muslims grew significantly in the northwest and southwest. Nestorian Christianity and Roman Catholicism were tolerated. Jewish communities existed. This was not tolerance born of principle so much as tolerance born of Mongol pragmatism — the Mongols ruled too many different peoples to impose a single faith, and they found it more useful to patronize all of them. The tolerance had limits. The Mongols imposed their own customs in some areas in ways that fell hard on Muslims and Jews. Genghis Khan had forbidden halal and kosher slaughter, forcing the Mongol method of butchering on his subjects and banning circumcision — Muslims had to slaughter sheep in secret. These restrictions continued under the Yuan, and toward the end of the dynasty, persecution of Muslims grew severe enough that Muslim generals joined the Han rebellions against Mongol rule. Culturally, the Yuan was a period of unexpected flourishing in particular areas. Chinese drama and the novel developed substantially during this period, partly because Chinese intellectuals shut out of government careers turned their talents to literature instead. Yuan drama — the zaju form — is considered a golden age of Chinese theater. The use of written vernacular Chinese expanded. Painting changed significantly, with literati painters developing styles that would dominate Chinese art for centuries. And the blue-and-white porcelain of the period became one of the great achievements of world ceramics. The irony is hard to miss: a dynasty that excluded the Chinese educated class from political power inadvertently triggered a creative renaissance in the arts, as that same class poured its frustrated energies into drama, fiction, and painting instead.
The Long Decline After Kublai
Kublai died in 1294, despondent in his final years after the deaths of his favorite wife and his chosen heir. He had grown enormously fat, suffered from gout and other ailments, and reportedly drank heavily. He was the last genuinely commanding figure the Yuan dynasty produced. What followed was seventy years of mostly weak, short-reigned emperors, palace intrigue, factional warfare, and steady institutional decay. The Mongol tradition had no clear rule of succession — it relied on the kurultai, the assembly of nobles, to choose a leader, which in practice meant that every imperial death triggered a power struggle. The Yuan never solved this. Emperors were assassinated, deposed, installed by powerful officials as puppets, and discarded. The War of the Two Capitals in 1328-29 saw rival claimants fight openly. One emperor, Kusala, died four days after a banquet with his brother, almost certainly poisoned. Some of the successor emperors were competent. Ayurbarwada Buyantu Khan, the fourth Yuan emperor, actively embraced Chinese culture, restored the examination system in 1313, and codified the laws. His son Gegeen Khan continued the Confucian reforms before being assassinated in a coup. Tugh Temür was a genuine patron of Chinese learning who founded an academy and sponsored major scholarly compilations, even though he was largely a puppet of the warlord El Temür. But the overall trajectory was downward. The financial problems that had begun under Kublai grew worse. Paper money was over-issued and inflated. Corruption spread. The bureaucracy was increasingly dominated by powerful officials and warlords rather than the throne. And the Mongol ruling class itself fell into poverty — ordinary Mongol garrison families in China lived in genteel decay, their income from Chinese tenant farmers eaten up by the costs of military service, while the elite positions were increasingly penetrated by Han Chinese anyway. The Mongols beyond China came to see the Yuan rulers as too Chinese. The Chinese saw them as foreign occupiers who had failed to govern well. The Yuan emperors were caught between two worlds and increasingly belonged to neither.
Famine, Rebellion, and the Red Turbans
The end came in the reign of Toghon Temür, who took the throne as a thirteen-year-old in 1333 and was the last of Kublai's successors to rule in China. He inherited a dynasty that was already failing, and a series of natural catastrophes finished it off. From the late 1340s onward, the countryside was hammered by disaster after disaster — droughts, then catastrophic floods as the Yellow River changed course, then famines that killed enormous numbers of people. The government's response was inadequate and badly managed. Massive forced-labor projects to control the Yellow River created exactly the kind of desperate, concentrated, angry population that produces rebellions. In 1351 the Red Turban Rebellion broke out — a movement mixing Buddhist millenarianism, Song-loyalist sentiment, and simple peasant fury at a government that could not feed them. It spread into a nationwide uprising. The rebels declared a restored Song dynasty. The Yuan armies, weakened by decades of decay and led by a court more interested in factional intrigue than in actually fighting, could not suppress it. In a particularly self-destructive move, in 1354 Toghon Temür dismissed his most capable general, Toghtogha, in the middle of a campaign against the rebels, out of fear of his growing power. The central government's last real chance to crush the rebellion went with him. Out of the chaos of the Red Turban movement emerged a figure who would change everything: Zhu Yuanzhang, a peasant from an impoverished family — orphaned by famine, once a Buddhist monk and a beggar — who rose through the rebel ranks to become a brilliant military commander. He outfought and outmaneuvered his rival rebel leaders, consolidated control of the south, and then marched north against the Yuan. In 1368, Zhu Yuanzhang's forces approached Khanbaliq. Toghon Temür did not stay to fight. He fled north to Shangdu, and then onto the Mongolian steppe, abandoning the capital his ancestor Kublai had built. Zhu Yuanzhang took the city and proclaimed the Ming dynasty, becoming the Hongwu Emperor. He was one of only two peasants in all of Chinese history to found a major dynasty. The Mongols had ruled all of China for less than a century. Now they rode back to the grasslands they had come from.
The Red Turban Rebellion, fueled by famine and flood, produced Zhu Yuanzhang — a peasant-turned-monk-turned-warlord who drove the Mongols out of China in 1368 and founded the Ming dynasty, becoming the Hongwu Emperor.
The Northern Yuan and What the Mongols Left Behind
The dynasty did not technically end in 1368. The Mongols carried the name Great Yuan back to the steppe with them and kept it alive as the Northern Yuan, ruling Mongolia and continuing to claim the imperial title. The Ming spent decades campaigning against them. Pockets of Yuan resistance held out in Yunnan until 1381 and in Manchuria until 1387. The Northern Yuan as a Genghisid state persisted until 1635, when the last khan submitted to the rising Manchu power that would become the Qing dynasty. So in a sense the line that Kublai founded ran, in the steppe, for another two and a half centuries after it lost China. What the Yuan left behind in China was substantial, even though the Chinese were glad to see the Mongols go. The provincial administrative structure the Yuan created — the system of branch secretariats that evolved into the provinces — was inherited and modified by the Ming and the Qing and is, in modified form, the basis of how China is administratively divided today. Beijing became a capital under the Yuan and has remained China's capital, with interruptions, ever since. The Grand Canal was renovated into the form that served China for centuries. The cultural achievements endured. Yuan drama and the developing vernacular novel fed directly into the Ming literary flowering. Blue-and-white porcelain became the dominant tradition in Chinese ceramics and one of the most recognizable art forms in the world. The astronomical and mathematical advances of the period — Guo Shoujing's calendar, Zhu Shijie's work on polynomial algebra and what amounts to early matrix methods, the exchange of scientific knowledge with the Islamic world — were real contributions that outlasted the dynasty. And the Yuan permanently changed how China understood itself in relation to the outside world. For ninety-seven years, China had been part of a vast Eurasian system, connected by trade and travel to Persia, the Middle East, and Europe in a way it had never been before and would not be again until the modern era. The China the Ming inherited was a China that had hosted Marco Polo, traded across the whole of Asia, and absorbed influences from half a continent. Kublai Khan's experiment — ruling China as a Chinese emperor while remaining a Mongol khan — ultimately failed. His successors could not hold the two roles together, and the Chinese never fully accepted them. But for one extraordinary century, the steppe and the sown were joined under a single throne, and the wealthiest civilization on earth was governed by the grandsons of nomads who could not read its books. There has been nothing quite like it before or since.
